<template>
  <div class="cart" :key="reload">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="item in cartInfoList" :key="item.id">
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="item.isChecked"
              @change="switchChecked(item.skuId, $event)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl" />
            <div class="item-msg">
              {{ item.skuName }}
            </div>
          </li>
          <li class="cart-list-con3">
            <div class="item-txt">语音升级款</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ item.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a
              href="javascript:void(0)"
              class="mins"
              @click="count(-1, item.skuId, item.skuNum)"
              >-</a
            >
            <input
              autocomplete="off"
              type="text"
              :value="item.skuNum"
              minnum="1"
              class="itxt"
              @change="countChange(item.skuNum, item.skuId, $event)"
            />
            <a
              href="javascript:void(0)"
              class="plus"
              @click="count(1, item.skuId, item.skuNum)"
              >+</a
            >
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ item.skuNum * item.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="delCart(item.skuId)"
              >删除</a
            >
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input
          class="chooseAll"
          type="checkbox"
          :checked="checkAll"
          @change="swichCheckedAll"
        />
        <span>全选</span>
      </div>
      <div class="option">
        <a href="#none">删除选中的商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ totalCheckedNum }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalcheckedPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
//  后台接口没有对应的全选和全删接口，所以可以利用单选和单删来处理
import { mapActions, mapState, mapGetters } from "vuex";
export default {
  name: "cart",
  data() {
    return {
      reload: 0,
    };
  },
  computed: {
    ...mapState({
      cartInfoList: (state) => {
        let cartInfoList = state.cart.cartInfoList;
        cartInfoList ? cartInfoList : [];
        return cartInfoList;
      },
    }),
    ...mapGetters([
      "noCheckAllIds",
      "checkAllIds",
      "checkAll",
      "totalcheckedPrice",
      "totalCheckedNum",
    ]),
  },
  methods: {
    ...mapActions(["getCartList"]),
    //删除购物车商品
    async delCart(id) {
      try {
        await this.$api.delCart(id);
      } catch (error) {
        //修改失败,一般是因为网络问题
      } finally {
        await this.getCartList();
      }
    },
    async count(adder, skuId, num) {
      //如果商品数量小于1,再减的话就直接删除
      if (num + adder < 1) {
        await this.delCart(skuId);
        return;
      }
      try {
        await this.$api.updateCart({ skuId, skuNum: adder });
      } catch (error) {
        //修改失败,一般是因为网络问题
      } finally {
        await this.getCartList();
      }
    },
    async countChange(skuNum, skuId, ev) {
      //skuNum是修改之前的数量，接口的数量为增量，输入的为总量，且只有一个接口
      let currentNum = +ev.target.value; //转为数字
      let adder = currentNum - skuNum;
      if (Number.isNaN(adder)) {
        //如果输入的内容不是数字，利用diff算法回退
        this.reload++;
        return;
      }
      await this.count(adder, skuId, skuNum);
    },
    async switchChecked(skuId, ev) {
      try {
        //只是动了数据库!!!!  没有动vuex仓库!!! 界面是不会更新的!!!!
        // isChecked:0代表取消选中
        // isChecked:1代表选中
        let isChecked = ev.target.checked ? 1 : 0;
        await this.$api.switchChecked({ skuId, isChecked });
      } catch (e) {
        //请求失败  一般都是网络问题
      } finally {
        //重新刷新界面!!! 动vuex仓库
        await this.getCartList();
      }
    },
    async swichCheckedAll(ev) {
      try {
        let isChecked = ev.target.checked ? 1 : 0;
        let skuIdArr = [];
        if (isChecked === 1) {
          //全选 skuIdArr:拿到所有未选中的数据的id
          skuIdArr = this.noCheckAllIds;
        } else if (isChecked === 0) {
          //全不选  skuIdArr:拿到所有选中的数据的id
          skuIdArr = this.checkAllIds;
        }
        await this.$api.switchAllChecked(skuIdArr, isChecked);
      } catch (e) {
        //请求失败  一般都是网络问题
      } finally {
        //重新刷新界面!!! 动vuex仓库
        await this.getCartList();
      }
    },
  },
  async mounted() {
    await this.getCartList();
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 4.1667%;
        }

        .cart-list-con2 {
          width: 25%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 20.8333%;

          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 12.5%;
        }

        .cart-list-con5 {
          width: 12.5%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 12.5%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 12.5%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>